Things are far more simpler in the Navy, where the letter "s" denotes plurality. . .Though I rarely dwelt upon the lingo the Army slung (I worked with two paratroopers at one point, one claiming his MOS was "Romeo" and the other proclaiming himself "X-Ray, and while this confused the fuck out of me, they seemed to think it perfectly rational), but as I understand things, a troop is a unit or body of men, a trooper is the singular entity.
